#include <stdio.h>
#include <math.h>
int main()
{
    int i, j, n = 0, x;
    for (i = 23; n == 0; i += 2)
    {
    for(j=1,x=i;j<=4&&x>=11;j++)
    
        if ((x + 1) % (j + 1) == 0)
            x -= (x + 1) / (j + 1);
        else
        {
            x = 0;
            break;
        }
        if (j == 5 && x == 11)
        {
            printf(" there are %d fishes as frist \n", i);
            n = 1;
        }
    }
}